A clinical trial of beta carotene to prevent basal-cell and squamous-cell cancers of the skin
Background. Beta carotene has been associated with a decreased risk of human cancer in many studies employing dietary questionnaires or blood measurements, and it has had protective effects in some animal models of carcinogenesis. Methods. We tested the possible cancer-preventing effects of beta car...
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Veröffentlicht in: | The New England journal of medicine 1990-09, Vol.323 (12), p.789-795 |
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Sprache: | eng |
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